This was my old computer background. Margaret suggested that its discordant colors and cacophonous design might be contributing to my general ill humor. It basically shouts, "be peaceful, dammit!" I'm taking any and all suggestions right now so I decided to change it.
This is the new one. It is a photo I took of the sunset on the marsh during a bike ride. It reminds me of riding my bike and it does seem to make me feel calmer. Because I have been in front of one computer screen or another for way too many days in a row now.
I'll let you know if it works.